Constraints on hydraulic parameters and implications for groundwater flux across the upland–estuary interface

Schultz, G. V.; Ruppel, Carolyn D.

doi:10.1016/s0022-1694(01)00616-3

Cited by 52 publications

(45 citation statements)

References 28 publications

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“…1 is solved using a finite element approximation. Porosity was set to the average value measured in multiple upland cores for depths within the model domain, and the intrinsic permeability-used to relate the measured pressure heads to computed flow velocitieswas set to the average of all hydraulic conductivities reported for MH (Schultz and Ruppel 2002). The dispersion coefficient was parameterized following Scheidegger (1961), with the longitudinal dispersivity for the 60 m long model domain set to an average value for sandy sediments (a L = 0.3 m; Moltyaner et al 1993) and the transverse dispersivity (a T ) set to 10% of the longitudinal dispersivity.…”

Section: Modeling Methodsmentioning

confidence: 99%

“…1). MH is bordered to the west by the Duplin River whose 11 km 2 watershed is dominated (*80%) by Spartina alterniflora saltmarsh and unvegetated mudflats (Pomeroy screen depths and distances from the Duplin River are given in Schultz and Ruppel (2002) and Snyder et al (2004) with the following well identification: 1 MW0208, 2 MW0214, 3 MW0203, 4 MW0202, 5 MW0201, 6 MW0217 and Wiegert 1981). The Duplin has a tidal amplitude of approximately 3.4 m for spring tide (Chalmers 1997), with a salinity, averaged over all sampling periods, of 25.7.…”

Section: Study Sitementioning

confidence: 99%

“…The MH upland is forested and separated from the upland of Sapelo Island by extensive Spartina marsh. The freshwater lens on MH is isolated from the saline aquifer underlying the island (Schultz and Ruppel 2002). A 80 m long transect of partially screened, groundwater monitoring wells (\5 m sampling depth) runs perpendicular to the Duplin River from the approximate center of MH to the saltmarsh (Schultz and Ruppel 2002; Fig.…”

Section: Study Sitementioning

confidence: 99%

“…Morse et al (1987); 6. Schultz and Ruppel (2002); 7. Moltyaner et al (1993) a Porosity is an average of the measured values (0.2-0.5).…”

Section: Appendixmentioning

confidence: 99%

“…When approaching the salinity interface, density effects become important, and tidal pumping can impact discharge to intertidal environments and estuarine receiving waters (Schultz and Ruppel 2002). Hammocks, backbarrier islands typically surrounded by saltmarshes, are common geomorphological features on the southeast coast of the United States.…”

Section: Introductionmentioning

confidence: 99%

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Field measurements and modeling of groundwater flow and biogeochemistry at Moses Hammock, a backbarrier island on the Georgia coast

et al. 2010

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A combination of field measurements, laboratory experiments and model simulations were used to characterize the groundwater biogeochemical dynamics along a shallow monitoring well transect on a coastal hammock. A switch in the redox status of the dissolved inorganic nitrogen (DIN) pool in the well at the upland/saltmarsh interface occurred over the spring-neap tidal transition: the DIN pool was dominated by nitrate during spring tide and by ammonium during neap tide. A density-dependent reaction-transport model was used to investigate the relative importance of individual processes to the observed N redox-switch. The observed N redox-switch was evaluated with regard to the roles of nitrification, denitrification, dissimilatory nitrate reduction to ammonium (DNRA), ammonium adsorption, and variations in inflowing water geochemistry between spring and neap tides. Transport was driven by measured pressure heads and process parameterizations were derived from field observations, targeted laboratory experiments, and the literature. Modeling results suggest that the variation in inflow water chemistry was the dominant driver of DIN dynamics and highlight the importance of spring-neap tide variations in the high marsh, which influences groundwater biogeochemistry at the marsh-upland transition.

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Section: Modeling Methodsmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

“…Morse et al (1987); 6. Schultz and Ruppel (2002); 7. Moltyaner et al (1993) a Porosity is an average of the measured values (0.2-0.5).…”

Section: Appendixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field measurements and modeling of groundwater flow and biogeochemistry at Moses Hammock, a backbarrier island on the Georgia coast

et al. 2010

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Surface water–groundwater exchange dynamics in a tidal freshwater zone

et al. 2015

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In coastal rivers, tides can propagate for tens to hundreds of kilometres inland beyond the saltwater line. Yet the influence of tides on river–aquifer connectivity and solute transport in tidal freshwater zones (TFZs) is largely unknown. We estimate that along the TFZ of White Clay Creek (Delaware, USA), 11% of river water exchanges through tidal bank storage zones. Additional hyporheic processes such as flow through bedforms likely contribute even more exchange. The turnover length associated with tidal bank storage is 150 km, on the order of turnover lengths for all hyporheic exchange processes in non‐tidal rivers of similar size. Based on measurements at a transect of piezometers located 17 km from the coast, tides exchange 0.36 m3 of water across the banks and 0.86 m3 across the bed per unit river length. Exchange fluxes range from −1.66 to 2.26 m day−1 across the bank and −0.84 to 1.88 m day−1 across the bed. During rising tide, river water infiltrates into the riparian aquifer, and the downstream transport rate in the channel is low. During falling tide, stored groundwater is released to the river, and the downstream transport rate in the channel increases. Tidal bank storage zones may remove nutrients or other contaminants from river water and attenuate nutrient loads to coasts. Alternating expansion and contraction of aerobic zones in the riparian aquifer likely influence contaminant removal along flow paths. A clear need exists to understand contaminant removal and other ecosystem services in TFZs and adopt best management practices to promote these ecosystem services. Copyright © 2015 John Wiley & Sons, Ltd.

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Hydrological Processes

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Constraints on hydraulic parameters and implications for groundwater flux across the upland–estuary interface

Cited by 52 publications

References 28 publications

Field measurements and modeling of groundwater flow and biogeochemistry at Moses Hammock, a backbarrier island on the Georgia coast

Field measurements and modeling of groundwater flow and biogeochemistry at Moses Hammock, a backbarrier island on the Georgia coast

Surface water–groundwater exchange dynamics in a tidal freshwater zone

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